I think a quick and easy way to test the aux fan is simply unplug the pressure switch down by the compressor. The fan should go spool up to full song if it is good.

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• 2004 E53 X5 3.0 ZSP (4/04 build date) Jet Black exterior/Sand Beige interior
• 2002 E46 325i ZPP (2/02 build date) Alpine White exterior/Hell Beige interior

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